CN206708066U - A kind of SCM Based rotating speed of DC fan is precisely controlled circuit - Google Patents
A kind of SCM Based rotating speed of DC fan is precisely controlled circuit Download PDFInfo
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- CN206708066U CN206708066U CN201621224267.XU CN201621224267U CN206708066U CN 206708066 U CN206708066 U CN 206708066U CN 201621224267 U CN201621224267 U CN 201621224267U CN 206708066 U CN206708066 U CN 206708066U
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Abstract
The utility model discloses a kind of SCM Based rotating speed of DC fan to be precisely controlled circuit,Including magnetic field induction unit IC2,Fans drive chip IC 1,Rotation speed of the fan control chip U3 and motor coil,The pin 2 of the magnetic field induction unit IC2 connects the pin 4 of fans drive chip IC 1,Magnetic field induction unit IC2 pin 1 connects the pin 5 of fans drive chip IC 1,The pin 3 of fans drive chip IC 1 connects diode D1 negative electrode and electric capacity C1,The utility model circuit loop increases a single-chip microcomputer control loop on the basis of existing customary DC fan application circuit,Pass through increased close loop control circuit,Pass through software programming,Rotating speed requirement of the fan in each points of PWM can freely be set,And it can independently detect the rotating speed of fan in itself,To compare detection with the rotating speed originally set,Automatically adjust output size,Make rotation speed of the fan stable in the range of+/ 100RPM,Substantially increase the rotating speed accuracy of fan,Improve the market competitiveness of the design.
Description
Technical field
A kind of control circuit is the utility model is related to, specifically a kind of SCM Based rotating speed of DC fan is precisely controlled
Circuit.
Background technology
The DC radiation fan used in the heat-producing devices such as computer is a kind of radiating product of at present.Its principle is logical
Crossing electrical energy drive promotes flabellum to rotate, and so as to drive air circulation to produce natural wind, then the flowing by wind, takes away heat, from
And reach the radiating of heat-emitting products.
It is not high for the rotating speed control accuracy of DC radiation fan motor in the prior art, conventional be all 2000 turns with
Under ± 300 turns, the rotating speed of more than 2000 turns of rotating speed ± 10% is to be improved.
Utility model content
The purpose of this utility model is that providing a kind of SCM Based rotating speed of DC fan is precisely controlled circuit, with solution
The problem of being proposed in certainly above-mentioned background technology, can make fan work in any environment, and rotating speed tolerance can accomplish ± 100
Turn, whether monomer fan test or be attached to inside heat radiation module is tested, and is even fitted on VGA and other end products and is surveyed
All, rotating speed is not any change for examination.
To achieve the above object, the utility model provides following technical scheme：
A kind of SCM Based rotating speed of DC fan is precisely controlled circuit, including magnetic field induction unit IC2, fans drive
Chip IC 1, rotation speed of the fan control chip U3 and motor coil, the pin 2 of the magnetic field induction unit IC2 connect fans drive core
Piece IC1 pin 4, magnetic field induction unit IC2 pin 1 connect the pin 5 of fans drive chip IC 1, fans drive chip IC 1
Pin 3 connect diode D1 negative electrode and electric capacity C1, diode D1 anode connection VDD, electric capacity C1 other end connection electricity
Hold C2, resistance R2, resistance R4, resistance R6 and GND, magnetic field induction unit IC2 pin 3 connects ground, fans drive chip IC 1
Pin 2 and the pin of fans drive chip IC 1 13 connect the both ends of motor coil, electric capacity C2 other end connection resistance respectively
R1, resistance R3 and resistance R5, resistance the R5 other end connection resistance R6 other end and the pin 16 of fans drive chip IC 1,
The resistance R3 other end connection resistance R4 other end and the pin 9 of fans drive chip IC 1, resistance R1 other end connection electricity
The R2 other end and the pin 8 of fans drive chip IC 1 are hindered, the pin 7 of fans drive chip IC 1 connects resistance R7, resistance R7
Other end connection fan rotating speed signals output end and rotation speed of the fan control chip U3 pin 2, fans drive chip IC 1 draws
Pin 1 connects resistance R8, electric capacity C3 and chip U4 pin 1, and chip U4 pin 3 connects 12V voltages, and chip U4 pin 2 connects
Ground, rotation speed of the fan control chip U3 pin 3 connect resistance R4 and electric capacity C4, resistance R4 other end connection PWM inputs, wind
The pin 7 for fanning rotating speed control chip U3 connects the pin 12 of fans drive chip IC 1.
As further scheme of the present utility model：Model EUM6861, AM7228 of the fans drive chip IC 1,
One kind in AM7228S, LB11967, LB11961 and MLX90297, magnetic field induction unit IC2 model HW101 and NE520
In one kind, rotation speed of the fan control chip U3 model MCU and PLC series of programs control IC, chip U4 model voltage stabilizing
The conventional decompression IC-78L05 series of power supply.
Compared with prior art, the beneficial effects of the utility model are：The utility model circuit loop is straight in existing routine
Increase a single-chip microcomputer control loop on the basis of flow fan application circuit, by increased close loop control circuit, pass through software
Programming, can freely set rotating speed requirement of the fan in each points of PWM, and can independently detect the rotating speed of fan in itself, with
The rotating speed originally set compares detection, automatically adjusts output size, makes rotation speed of the fan stable in the range of +/- 100RPM, greatly
The big rotating speed accuracy for improving fan, improve the market competitiveness of the design.
Brief description of the drawings
Fig. 1, Fig. 2 are circuit diagram of the present utility model；
Fig. 3, Fig. 4 are the circuit diagram of prior art.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Fig. 1-4 are referred to, a kind of SCM Based rotating speed of DC fan is precisely controlled circuit, including magnetic field induction unit
IC2, fans drive chip IC 1, rotation speed of the fan control chip U3 and motor coil, the pin 2 of the magnetic field induction unit IC2 connect
Wind-receiving fan driving chip IC1 pin 4, magnetic field induction unit IC2 pin 1 connect the pin 5 of fans drive chip IC 1, wind
The pin 3 for fanning driving chip IC1 connects diode D1 negative electrode and electric capacity C1, and diode D1 anode connects VDD, electric capacity C1's
Other end connection electric capacity C2, resistance R2, resistance R4, resistance R6 and GND, the magnetic field induction unit IC2 connection of pin 3 ground, fan
Driving chip IC1 pin 2 and the pin 13 of fans drive chip IC 1 connect the both ends of motor coil respectively, and electric capacity C2's is another
One end connection resistance R1, resistance R3 and resistance R5, resistance the R5 other end connection resistance R6 other end and fans drive chip
IC1 pin 16, resistance the R3 other end connection resistance R4 other end and the pin 9 of fans drive chip IC 1, resistance R1's
The other end connection resistance R2 other end and the pin 8 of fans drive chip IC 1, the pin 7 of fans drive chip IC 1 connect electricity
Hinder R7, resistance R7 other end connection fan rotating speed signals output end and rotation speed of the fan control chip U3 pin 2, fans drive
The pin 1 of chip IC 1 connects resistance R8, electric capacity C3 and chip U4 pin 1, and chip U4 pin 3 connects 12V voltages, chip
U4 pin 2 is grounded, and rotation speed of the fan control chip U3 pin 3 connects resistance R4 and electric capacity C4, resistance R4 other end connection
PWM inputs, rotation speed of the fan control chip U3 pin 7 connect the pin 12 of fans drive chip IC 1.
As further scheme of the present utility model：Model EUM6861, AM7228 of the fans drive chip IC 1,
One kind in AM7228S, LB11967, LB11961 and MLX90297, magnetic field induction unit IC2 model HW101 and NE520
In one kind, rotation speed of the fan control chip U3 model MCU and PLC series of programs control IC, chip U4 model voltage stabilizing
The conventional decompression IC-78L05 series of power supply.
Operation principle of the present utility model is:Circuit includes conventional DC fan application circuit, and the type such as MCU/PLC
Single-chip microcomputer rotating speed is precisely controlled circuit, single-chip microcomputer power supply mu balanced circuit etc..The customary DC fan application that application circuit includes
Circuit, it includes fan driving unit, fan motor part, PWM input control units (also directly inputting mode), Hall
IC magnetic field induction units；The Hall IC magnetic field induction units are a conventional Hall sensing IC, and it is directly with fan
Driver IC connections, there is provided give driving bis- groups of magnetic field switching signals of IC, making control for driving IC judges；The fans drive list
Member, it is connected with Hall IC and PWM control units are connected, and the everything and rotating speed of fan is controlled, according to outside input
Pwm signal Duty dutycycles are different and export different output signals；The fan motor part, it is by silicon steel sheet (for 3-9 poles
Different numbers of poles), the coil that is wrapped on silicon steel sheet composition, it provides power source for fan；The PWM inputs control unit,
Application at present has two class fans drive IC, and this kind of control circuit directly accomplishes inside driving IC that external PWM signal directly inputs
Into driving IC, another kind of fans drive IC needs outer control loop.
The type single-chip microcomputer rotating speed such as MCU/PLC is precisely controlled circuit, and it is by the type list such as power good circuit and MCU/PLC
Piece machine auxiliary circuit forms；The type single-chip microcomputers such as the type single-chip microcomputer operation principle such as described MCU/PLC, MCU/PLC receive outer
After portion's control pwm signal, export a pwm signal according to the same frequency of extraneous signal, the same Duty dutycycles and be given to fan
In PWM regulation circuits in control circuit, fan normal work is controlled, the FG signals of a rotating speed are fed back after fan normal work
It is given to the type single-chip microcomputers such as the type single-chip microcomputer such as MCU/PLC, MCU/PLC and carries out contrasting detection according to setting program, if tach signal
In setting specification, then existing output is maintained, if rotation speed of the fan is higher, turns down the dutycycle output of pwm signal accordingly, make
Rotation speed of the fan is appropriate to be reduced in specification limit；If it is too low to detect rotation speed of the fan, by heightening accounting for for PWM output signal accordingly
Empty ratio, make the appropriate rising of the rotating speed of fan, to reach in setting specification.
Claims (2)
1. a kind of SCM Based rotating speed of DC fan is precisely controlled circuit, including magnetic field induction unit IC2, fans drive core
Piece IC1, rotation speed of the fan control chip U3 and motor coil, it is characterised in that the pin 2 of the magnetic field induction unit IC2 connects
The pin 4 of fans drive chip IC 1, magnetic field induction unit IC2 pin 1 connect the pin 5 of fans drive chip IC 1, fan
Driving chip IC1 pin 3 connects diode D1 negative electrode and electric capacity C1, and diode D1 anode connection VDD, electric capacity C1's is another
One end connection electric capacity C2, resistance R2, resistance R4, resistance R6 and GND, the magnetic field induction unit IC2 connection of pin 3 ground, fan drive
The pin 2 of dynamic chip IC 1 and the pin 13 of fans drive chip IC 1 connect the both ends of motor coil respectively, and electric capacity C2's is another
End connection resistance R1, resistance R3 and resistance R5, resistance the R5 other end connection resistance R6 other end and fans drive chip IC 1
Pin 16, resistance the R3 other end connection resistance R4 other end and the pin 9 of fans drive chip IC 1, resistance R1's is another
One end connection resistance R2 other end and the pin 8 of fans drive chip IC 1, the pin 7 of fans drive chip IC 1 connect resistance
R7, resistance R7 other end connection fan rotating speed signals output end and rotation speed of the fan control chip U3 pin 2, fans drive core
Piece IC1 pin 1 connects resistance R8, electric capacity C3 and chip U4 pin 1, and chip U4 pin 3 connects 12V voltages, chip U4
Pin 2 be grounded, rotation speed of the fan control chip U3 pin 3 connects resistance R4 and electric capacity C4, resistance R4 other end connection PWM
Input, rotation speed of the fan control chip U3 pin 7 connect the pin 12 of fans drive chip IC 1.
2. a kind of SCM Based rotating speed of DC fan according to claim 1 is precisely controlled circuit, it is characterised in that
In model EUM6861, AM7228, AM7228S, LB11967, LB11961 and MLX90297 of the fans drive chip IC 1
One kind, one kind in magnetic field induction unit IC2 model HW101 and NE520, rotation speed of the fan control chip U3 model
MCU and PLC series of programs controls IC, the chip U4 conventional decompression IC-78L05 series of model voltage-stabilized power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621224267.XU CN206708066U (en) | 2016-11-10 | 2016-11-10 | A kind of SCM Based rotating speed of DC fan is precisely controlled circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621224267.XU CN206708066U (en) | 2016-11-10 | 2016-11-10 | A kind of SCM Based rotating speed of DC fan is precisely controlled circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206708066U true CN206708066U (en) | 2017-12-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621224267.XU Active CN206708066U (en) | 2016-11-10 | 2016-11-10 | A kind of SCM Based rotating speed of DC fan is precisely controlled circuit |
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| CN (1) | CN206708066U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351865A (en) * | 2016-11-10 | 2017-01-25 | 东莞市富士多实业投资有限公司 | Direct current fan rotating speed precise control circuit based on single chip microcomputer |
| CN109340160A (en) * | 2018-09-21 | 2019-02-15 | 孙可歆 | Anti- " pedaling quilt " fan |
-
2016
- 2016-11-10 CN CN201621224267.XU patent/CN206708066U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106351865A (en) * | 2016-11-10 | 2017-01-25 | 东莞市富士多实业投资有限公司 | Direct current fan rotating speed precise control circuit based on single chip microcomputer |
| CN109340160A (en) * | 2018-09-21 | 2019-02-15 | 孙可歆 | Anti- " pedaling quilt " fan |
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Hengli Town 523000 Guangdong city of Dongguan Province along the Yangtze River Industrial Zone No. 8 pit Patentee after: Guangdong Fuji Industry Investment Co., Ltd. Address before: Hengli Town 523000 Guangdong city in Dongguan province across the pit along the Yangtze River Industrial Zone No. 8 building two layer Patentee before: FIRSTDO INVESTMENT ENTERPRISE CO., LTD. |
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| CP03 | Change of name, title or address |